Sorry about your troubles on this one. We managed to ship a small bug in the 3.1.3 release. (The only one, we think.) You hit a very rare condition — in fact, only about three or four plugins in the entire directory can trigger this condition.*

My Media Library is working, but I get the following warnings after upgrading to 3.1.3:

Warning: explode() expects parameter 2 to be string, array given in /Users/capneb/Sites/blankfield.net/blankfield.net/wp-includes/query.php on line 2390

Warning: in_array() expects parameter 2 to be array, null given in /Users/capneb/Sites/blankfield.net/blankfield.net/wp-includes/query.php on line 2399

The second warning appears 8 times on my page when on the Media Library page or the image box is open (adding an image to a post/page with Media Library tab selected). All plugins deactivated. The warnings disappear after downgrading to 3.1.2.

Hi, I think I have some similar issue…
My media library looks ok, but I’m unable to upload any new image on my posts.
I’ve installed the hotfix plugin but it didn’t solved.
I’ve also disabled all plugins, but it makes no difference.
Any idea?